Change Of Expansion Vessel; Domestic Water Side; Heating System Open Fluid Appliances; Heating System Balanced Flued Appliance - Vaillant VCW 2O Instructions For Installation And Servicing

8.33 Ghange of expansion vessel
8.33.1 Domestic water side
Disconnect the tubing nut (W1), unscrew
bracket securing screw and remove expansion
vessel complete with bracket. Unscrew vessel
from bracket. Reassemble with new domestic
water expansion vessel in reverse order.
8.33.2 Heating system open flued
appliances
Disconnect the flue at split collar. Remove 2
screws and nuts, securing the upper retaining
frame. Lift rear of frame clear of side frames
and rest it on top of draught diverter. Remove
screws securing draught diverter and remove
together with upper retaining frame. Remove
draught diverter retaining frame by removing
the 2 retaining screws. Undo the union nut
(W3), move the expansion vessel up and take it
off. Reassemble in reverse order, taking care
that the expansion vessel is correctly fixed into
the 2 supports. Use new washer, if necessary.
8.33.3 Heating system balanced flued
appliance
lsolate electrical mains and remove mains
cable. Close off water and gas service cocks
and drain the appliance as outlined in 8.1.2.
Disconnect flow and return connections at
compression joints on top of service cock.
Disconnect gas connection at compression
joint on top of gas cock. Disconnect domestic
hot and cold connections on diaphragm body.
Slacken locking nuts on flow and return
connections. Remove nuts from bolts (1 in
fig. 14) on terminal/duct assembly Rerirove
boiler from wall. Disconnect sleeve nut (W3)
and remove expansion vessel. Reassemble in
reverse order, taking care that the expansion
vessel is correctly fixed to the 2 supports.
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